I sound like a broken record because this is my third post on the subject (I think the company should hire me!!). Anyway, my tent was only $100, it is perfect for my use (32" sq x 5' H), and it has a thicker canvas than most grow tents. The company I got it from also sells them on ebay, so check there before you buy direct, it may be cheaper:
http://www.gothamhydroponics.com/
(DISCLAIMER: No, I do NOT work for them, I swear! Grow tents just seem to be a hot topic today and I can only go by my experience. I am very pleased with my tent from this company. Good price, good quality, and I think even the shipping was free!)